#Mastodon does still show you posts in languages you don't want to be displayed in your feed if they include a tag you follow.
What about posts and replies from people you follow?
Anyone seeing my German posts despite not having German selected as a language?
@yora your home feed is not a "public" feed, which the language settings only apply to.
@BeAware That explains the cause of this feature that I consider a bug.
@yora yep, it's not a bug because you're specifically following people/hashtags so I guess they assume you want to see them, despite what language they use.